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x in (-oo:+oo)
y = (1/5)*x-9 // - (1/5)*x-9
y-((1/5)*x)+9 = 0
(-1/5)*x+y+9 = 0
y-1/5*x+9 = 0 // - y+9
-1/5*x = -(y+9) // : -1/5
x = (-(y+9))/(-1/5)
x = 5*(y+9)
x = 5*(y+9)
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